Subtitle 4Sampling and Monitoring § 4-1. In general. § 4-2. Scope and frequency of reports. § 4-3. Required sampling and analytical techniques. § 4-4. Violations discovered by self-monitoring. § 4-5. Additional monitoring to be reported. § 4-6. Construction and placement of sampling and monitoring facilities. § 4-7. Number of measurements; equipment. § 4-8. Right of entry; inspections.